Forwarding proxy(commonly referred to as "proxy") is a kind of proxy server, which usually transmits requests from users in the internal network to the Internet through the firewall. The forwarding proxy is configured to allow or deny requests for users to access Internet content through the firewall. If the proxy allows the user's request, it forwards it to the web server through the firewall. The web server sends its response to the proxy. The proxy then sends this response back to the user. The forwarding proxy will first check whether the information requested by the user is cached, and then retrieve it from the server. The proxy itself stores cached information without requesting it from the server. If the requested information is cached, the proxy sends it directly to the user. If the proxy rejects a user's request, it sends an error or redirect message to the user.
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